When shooting 45 gr bullets I use 2230_C and IMR 4895,
I looked in my old Lyman manuel and it gives factory velocity duplication load as IMR 4320 @3048 fps and 42,400 cup.This was 50 gr bullet didn't have 45 listed.
This is an old manuel dated 1970.
I shot a box of the win 45 that said 3600 has anyone check the speed to see how close that was ?They did shoot fairly well.